Different behaviour in debugging and stand-alone

You really will have to be more specific. "It doesn't work" has not ever been a useful description of any malfunction, and probably never will be.

So:

0) What does "it works" mean to you? I.e. what does your program do?

1) How exactly does it fail?

2) What "debug mode" are you talking about? MON51?

You really will have to be more specific. "It doesn't work" has not ever been a useful description of any malfunction, and probably never will be.

So:

0) What does "it works" mean to you? I.e. what does your program do?

1) How exactly does it fail?

2) What "debug mode" are you talking about? MON51?

Ok, I see, my desciption is poor ;-)

I use for debugging the Cygnal C8051F Driver, newest version.

This is my code:

main()
{
  if ( RSTSRC == 0x08 )
  {
    WDTErrorFlag = 1;
    Initialize();
    ShowError( E_WD );
    Wait1Min();
    WDTErrorFlag = 0;
    RSTSRC = 0x10;
  }
  else
  {
    WDTErrorFlag = 0;
    DoSomething();
  }
}

I don't know that particular chip. But this:

	RSTSRC == 0x08

	(RSTSRC & 0x08) == 0x08

There is nothing in your code that prevents the program from exiting the main function.

Perhaps that is the cause of the second "reset".

Typically, the main C function for embedded programs is implemented as follows:

void main (void)
{
whilw (1)
  {
  /*** do something ***/
  }
}

Hello!

The while(1)-loop is within the else-part.
The problem was the test indeed! Thanks very much!!